Galvanomagnetic device and magnetic sensor
a technology of galvanomagnetic devices and magnetic sensors, applied in galvano-magnetic hall-effect devices, magnetic bodies, instruments, etc., can solve the problems of not easy to form these films with several nanometer level uniformity, and not easy to achieve sufficient soft magnetic properties
Inactive Publication Date: 2013-04-30
WESTERN DIGITAL TECH INC
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Problems solved by technology
This problem is not unique to read devices in HDDs.
Although Al or Mg oxide films are mainly used as barrier films, it is not easy to form these films with several nanometer level uniformity.
However, since a perpendicular magnetization film generally exhibits a large demagnetizing field perpendicular to the film surface, it is not easy to attain sufficiently soft magnetic properties, namely several hundred A / m in terms of the reversal magnetic field.
Method used
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Embodiment Construction
[0020]Embodiments of the present invention relate to galvanomagnetic devices and magnetic sensors using galvanomagnetic devices. It is a first object of certain embodiments of the present invention to provide a perpendicular magnetization film-used galvanomagnetic device which allows easy magnetization reversal and eliminates the necessity of fabricating the insulation film and others so uniformly. It is a second object of certain embodiments of the present invention to provide a magnetic sensor which uses a galvanomagnetic device composed of fewer constituent elements.
[0021]To attain a the above-mentioned first object, embodiments of the present invention provide a galvanomagnetic device comprising: a non-conductive substrate; a first magnetic layer which is formed on the non-conductive substrate and has a magnetic anisotropy perpendicular to the surface thereof; a second magnetic layer which is formed on the first magnetic layer; electrodes which pass a current through the first m...
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Abstract
Embodiments of the present invention relate to a galvanomagnetic device for use as a magnetic sensor or magnetic memory device. In a particular embodiment, the galvanomagnetic device comprises a non-conductive substrate, a first magnetic layer having a magnetic anisotropy perpendicular to the surface thereof, and a ferromagnetic second magnetic layer formed on the first magnetic layer. On the second magnetic layer, current electrodes are disposed to pass a current between two points, and voltage electrodes are disposed to detect a Hall voltage between two points perpendicularly to the current flow direction.
Description
CROSS-REFERENCE TO RELATED APPLICATION[0001]The instant nonprovisional patent application claims priority to Japanese Patent Application No. 2007-336790 filed Dec. 27, 2007 and which is incorporated by reference in its entirety herein for all purposes.BACKGROUND OF THE INVENTION[0002]Recently, individual users of computing devices have begun to handle large amounts of information. Consequently, the demand for higher density magnetic recording apparatus, representatively hard disk drives (hereinafter, referred to as HDDs); are intensifying more and more. To attain a higher density HDD, it is important to not only increase the linear recording density in the circular direction but also increase the number of tracks spaced in the radial direction of the disk, namely raise Tpi (Tracks per inch). To realize a higher Tpi, it is essential to shorten the track pitch and narrow the track width. To accurately read data recorded on a narrow track, it is important not to read data from adjacent...
Claims
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IPC IPC(8): G11B5/39H01L43/06H01F10/06
CPCG01R33/07G11B5/374H01F10/137H01L43/06G11C11/18Y10T428/1121Y10T428/1129Y10T428/1143Y10T428/1171H10N52/00
Inventor SARBANOO, DASSUZUKI, HIROYUKIOHTSU, TAKAYOSHI
Owner WESTERN DIGITAL TECH INC